Drilling-machine



(No Model.) 2 Sheets-sheen 1..

W. FREGH.

DRILLING MACHINE.

Patented'f'eb. 23,1886..

2 Sheets-Sheet 2.

(No Model.)

W. FRBGI-I.

DRILLING MACHINE.

Patented Feb. 28, 1886.

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N. PETERS. Phnxo-uihagmpher. washinmon, DA C4 UNITED i STATES PATENT OFFICE. l

VILLIAM IPR-ECH, OF CHICAGO, ILLINOIS.

DRILLlNe-MACHINE.

SPECIFICATION forming part of LettersPatent No. 336.849, dated February 23, 1886.

Application tiled August 3l, 1885. Seri-.ll No. 175,728. (No model.)

To all whom it may concern.: y

Beit known that I, WILLIAM Franca, a citizen of the United States, residing'at Chicago, in the county of lCook and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification, vto wit:

This invention relates to drilling-machines; and it consists in certain peculiarities of the construction and arrangement of the same, substantially as will be hereinafter more fully set forth and claimed. i

`In order to enable others-skilled in the art to which myinvention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the accompanying,` drawings, in which* Figure l is a perspective view of my drilling-machine; Fig. 2, a side elevation ofthe same; Fig. 3, a vertical section of the-hollow standard; Fig. 4, a cross-section of Vthe'same; and Fig. 5 is a detail front View ofthe sliding table and its lever-connections.

a represents the base of In y drilling-machine, and c a hollow standard on which theinechanism of the machine is supported, and which is formed on one side with a vertical slot, c2, as fully seen in Figs. l and 3. The base a is 1 on its rear side provided with suitable supports, a, in which is journaled the drivingshaft a", carrying a cone-pulley, c5, and'fast and loose driving-pulleys a ai, to which a driving-belt is connected from any suitable power. Upon the hollow standard is placed a sleeve, b, split, as usual, on its rear side, and secured together to clamp the standard by a clamping-screw, b', which is formed witha suitable'handle for grasping by the operator, as in the drawings. From this sleeve on its forward side projects an arm, bg, on the outer end of which is a guide-sleeve, b, in which slides freely a spindle, c, carrying the worktable c' on its upper end. rllhis table, as will be seen in the drawings, is provided on one side with a guide, ci, which completely encircles and slides upon the standard, and aids in preventing any possible yielding of the table under pressure, and retains it always in its proper position relative to the drill. The lower end of the sliding spindle is provided with a collar, ci, made adjustable by means ol' a set-screw, c, so that it may be set up or down on the spindle, and act as a stop against the sleeve bi, to prevent lifting the table too far. This feature is particularly valuable in drilling aseries of holes, all of a given depth, as the stop may be set at the proper point, and all care Von the part of the operator is avoided. A lever, d, is fulcrumed on the sleeve b, and one end is bya link, d', connected to the stopcollar c3, so that depressing the outer end of this lever will lift the table, as will be evident in Fig. 5. Upon the upper end ofthe hollow standard fis the head e, which projects over the work-table, and in this forward portionis j ournaled thel shaft e, carrying the chuck e'z for receivingand holding the drill, and a small belt-pulley, c, around which passes the driving-belt to the cone speed-pulley on the main shaft. `All of this portion of the machine is well known, and needs no description at this place. Upon the upper rea-r corner of the head is fulcrumed a hand-lever,f, the rear end of which extends downward in rear of the main part of the head and carries the angle guidepulleys f', over which the belt f2 is guided around the angle between t-he horizontal driving-shaft and the vertical drill-shaft.

In'changing the belt from one portion of the cone-wheel to another it is evident that the belt as used will be of improper length, and to take up the slack and render it operative under each condition l sccurethe guide-pulleys on the hinged arm or lever, and provide the latter with a curved concentric slot, f3, through which a setscrew,f, passes into the head, in order that the guide-pulleys may be setrigidly at any desired point to suit the diferent conditions.

1t will be observed that the length of the lever or arm carrying the guide-pulleys is such, and its fulcrunI-point so located, as indicated by dotted lilies in Fig. 2, that not only is the slack taken ont of the belt, but the pulleys are thrown when adjusted into the proper position to exactly align with the several conefaces and prevent any tendency of the belt to run off or to wear its edge against the next pulley-face, as will be evident, and the length of the radius ofthe swingingarm also allows the taking up of the slack ot'a stretched belt to its utmost extent before there will be any tendency to displace the belt in use.

ltis evidentthat this device is not conncd ICO to drills, but is equally applicable to any position or machine where it is desired to carry a belt around an angle to or from a conepulley. v

To properly gage the proper point of setting the guide-pulleys for alignment, I provide the segment containing the curved slot f3 wit-h a series of small projections or marks, g, which register with some point or mark, g', on the main frame, and at this point will be found the proper position of the guides. One of these gages will be provided for each beltface of the cone. Within the hollow standard is journaled a screw-rod, h, on the lower end of which is a nut, h', having a small arm or projection, h2, which passes through the slot in the side of the standard, and is secured to a sliding collar, h, around the same beneath the split'sleeve b. Upon the upper end of the screwrod is a small pinion, with which meshes a similar pinion, i', on the end of a short shaft, i, journaled in the` side of the head, and provided with a small hand-wheel, i, on its end, within easy reach of the operator.

In operation the sleeve b, carrying the work-table, is lifted or lowered as desired by means of the connection with the screw'shaft, which is wholly inclosed within the hollow standard, and is thus kept free from clogging or in any manner getting entangled in the work, and which offers a positive and easy means of obtaining a very fine adjustment.

After adjustment the clamping-screw is used to secure the split sleeve in place, and as this sleeve is free of the collar on which it rests it is easily swung around to bring any part of the table beneath the drill. The work is pressed upward to the drill by means ofthe lever d, and as the table is not only firmly secured upon its supporting-spindle, but also entirely encircles the main standard, it cannot by any pressure spring out of place, but will always carry the work, steadily to the drill. The beltf'l is quickly changed from one face of the cone to another by simply loosening the clampingscrewf, changing the belt, and after taking up the slack securing the screw again, and the swinging of the arm on which the guide-pulleys are carried always obtains an adjustment in direct alignment with all the pulleys when the belt is properly stretched. The hand-lever f is of course not essential, being only a convenient and simple means of moving the guide-pulleys when adjusting them. It will be observed that the arm or 'lever on which the guide-pulley is carried is angular, is pivotedat its angle, and the outer arm of the lever is enlarged to form a handle at the outer end, which enlargement acts as a Weight; and in drilling light work it is sometimes found advisable not to clamp the adjustable lever-arm, but to allow its guide-pulley to be held up in the angle ofthe belt simply by the leverage of this weight, which is of course made of any size demanded for such use, and not only holds the belt in position and takes up the slack, but also keeps just suicient tension upon it to operate the drill, but will let the belt slip should any unusual strain be put upon it, a fact of some importance in delicate work.

Having thus fullj,1 described my invention, what I claim as new and desire to secure by Letters Patent, is-

1. The combination,with aplain belt-pulley, and a cone-pulley placed at right angles thereto and connected by a driving-belt, of an angular lever pivoted at its angle and provided on one arm with a guide-pulley for the belt, and on the other with an enlarged or weighted portion, substantially as described, whereby the weight of the lever-arm regulates the tension of the belt and guides it as well.

2. The combination,with two belt'pulleyssituated at an angle, and one orboth of which is a cone-pulley, of a guide-pulley between the two, a pivoted arm on which the pulley is carried, a curved slotin said arm through which is passed a SetscreW, and a series of indicating-marks to gage the adjustment, substantially as and for the purpose set forth.

3. In a drilling-machine, the combination, with the main standard and an arm projecting therefrom, of a work-table supported upon a spindle sliding vertically in the end of said arm, and having a collar completely encircling the main standard, substantially as and for the purpose set forth.

4. The combination, in a drilling-machine, of a hollow standard, a table-carrying arm sliding vertically thereon, ascrew-rod inclosed within the standard and having a nut connected to and supporting said arm, abandwheel geared to the screw-rod for operating it, a drill-spindle having a belt-pulley on it, a drivingcone at right angles thereto, and a guide-pulley supported between them upon a pivoted arm, substantially as and for the pur pose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

VILLIAM FRECH. Witnesses:

C. S. HARRISON, W. C. MOARTHUR.

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